（C）2006 Valve Corporation. All rights reserved. Valve, the Valve logo, Half-Life, the Half-Life logo, the lambda logo, Source, and the Source logo are trademarks and/or registered trademarks of Valve Corporation. All other trademarks are property of their respective owners.

（C）2004 Valve Corporation. All rights reserved. Valve, the Valve logo, Half-Life, the Half-Life logo, the Lambda logo, Counter-Strike, the Counter-Strike logo, and Source are registered trademarks and/or trademarks of Valve Corporation in the U.S. and/or other countries. Sierra and the Sierra logo are registered trademarks or trademarks of Sierra Entertainment, Inc. in the U.S. and/or other countries. Vivendi Universal Games and the Vivendi Universal Games logo are trademarks of Vivendi Universal Games, Inc. in the U.S. and/or other countries. All other trademarks are property of their respective owners.